You have a few alternatives, which all basically narrow down to stepping it up
You should try and change your
exercises and the wight you're lifting at lest every 6 weeks. Also if you take into account the main muscle groups you need to exercise, and your
goal, then you could very easily just plugin different exercise types and create variety. I will presume you want to tone up and get some definition (pls correct me if I'm wrong).
So your muscle groups (very simplistically put) will be:
Chest
Back
Shoulders
Biceps
Triceps
Quads
Hamstrings
Glutes
Calves
You could choose to split this into two separate workouts or you could do the whole lot in one workout combining supersets and compound movements.
Again, it very much depends on your personal goals.
Then, add
body weight type
exercises, instead of your dumbells. You could also use KettleBells, or do compound
exercises. There are resistance bands and balance balls...
If you do a search on the forum or indeed the internet - you will find some really good and worthwhile programs.
There are so many ways to progress your resistance training. You just have to decide which way to go.